NOTICE DATE:  September 26, 2017

NOTICE TYPE:  W-A013017-02 Operations

SHORT DESCRIPTION: Re-evaluation of maximum Shadow Price for an irresolvable constraint in SCED

INTENDED AUDIENCE: ERCOT Market Participants

DAY AFFECTED:  September 25, 2017

LONG DESCRIPTION: On September 25, 2017, ERCOT re-evaluated the maximum Shadow Price for an irresolvable constraint that had accumulated a net margin larger than $95,000 on September 23, 2017 per the criteria defined in in Section 3.6.2 of the business practice document, “Setting the Shadow Price Caps and Power Balance Penalties in Security Constrained Economic Dispatch.” 

The maximum shadow price for the following contingency/constraint pair was re-determined in accordance with Section 3.6.2 of that same document and will remain as $2,000 per MWh:

Contingency Name	Constraint Name	Description	Previous Maximum Shadow Price	New Maximum Shadow Price
SWCSBOO8	BARL_FTSW1_1	Loss of the 138 kV line from Fort Stockton Plant to Barilla and Solstice overloading the 69 kV line from Barilla to Fort Stockton Switch	$2,000 /MWh	$2,000 /MWh

 

Correction to the previous Market Notice W-A013017-01: The description of the constraint element is the 69kV line from Barilla to Fort Stockton Switch.

ADDITIONAL INFORMATION:  The ERCOT Business Practice, Setting the Shadow Price Caps and Power Balance Penalties in Security Constrained Economic Dispatch, is posted in the Methodology for Setting Maximum Shadow Prices for Network and Power Balance Constraints link under Key Documents on the Real-Time Market webpage of the ERCOT website.

CONTACT:  If you have any questions, please contact your ERCOT Account Manager. You may also call the general ERCOT Client Services phone number at (512) 248-3900 or contact ERCOT Client Services via email at ClientServices@ercot.com.

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NOTICE DATE:  January 30, 2017

NOTICE TYPE:  W-A013017-01 Operations

SHORT DESCRIPTION: Implementation of maximum Shadow Price for an irresolvable constraint in SCED

INTENDED AUDIENCE: ERCOT Market Participants

DAY AFFECTED:  January 30, 2017

LONG DESCRIPTION: ERCOT is implementing a modified maximum Shadow Price for a constraint that was found to be irresolvable per the criteria defined in Section 3.6.1 of the ERCOT Business Practice document, “Setting the Shadow Price Caps and Power Balance Penalties in Security Constrained Economic Dispatch.”  The contingency/constraint pair and maximum Shadow Price (set in accordance with Section 3.6.2 of that same document) are as follows:

Contingency Name	Constraint Name	Description	Maximum Shadow Price
SWCSBOO8	BARL_FTSW1_1	Loss of the 138 kV line from Fort Stockton Plant to Barilla and Solstice overloading the 138 kV line from Barilla to Fort Stockton Switch	$2,000.00

 

ADDITIONAL INFORMATION:  The ERCOT Business Practice, Setting the Shadow Price Caps and Power Balance Penalties in Security Constrained Economic Dispatch, is posted in the Methodology for Setting Maximum Shadow Prices for Network and Power Balance Constraints link under Key Documents on the Real-Time Market webpage of the ERCOT website.

CONTACT:  If you have any questions, please contact your ERCOT Account Manager. You may also call the general ERCOT Client Services phone number at (512) 248-3900 or contact ERCOT Client Services via email at ClientServices@ercot.com.

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